By the end of the 21st century, scientists__________a cure for the common cold.
Đáp án B
Câu sử dụng thì tương lai hoàn thành vì có cụm từ “By the end of the 21st century”
Which of the followings is NOT an evidence of monitoring studying?
Our flight was delayed, but the plane finally _______shortly after midnight.
It can be a very (30) __________ surprise if you expect to shake hands and get a kiss or a hug instead.
Which of the followings is the flow of water from the ground to the surface?
But things are more likely to turn (80) ________ well if you persevere and stay positive.
Which of the followings is NOT badly affected by contaminated groundwater?
So, before you (90) ________ out to get yourself the latest technological appliance, think long and hard as to whether a notebook PC is really suitable for you.